If you have air-conditioning in your car the best and fastest solution is to turn it on and set it to the windscreen outlets. Air-conditioners cool your car on a hot day by removing water vapour from the air inside the car, which reduces the temperature of the air. So operating your air-conditioner will immediately start removing water vapour from your car on a cold morning too, so that your warm, moist breath will disperse into the air inside the car rather than condensing on the windscreen.

Turning the air-conditioner up high for a little while and directing it through the windscreen vents will also evaporate the water condensed on your windscreen.

Many drivers, particularly women who feel the cold, will press the 'demist' button on their dashboard and then suddenly stab at the air-conditioning controls to turn off the rush of cold air they weren't expecting. Do that and you're actually working against yourself.

If you don't like the cold, dry air blowing on you from the air vents, turn off the vents facing you, point them at the side windows (which will start demisting the side windows) or try this: turn up the heat on the temperature control.

Because we're so used to thinking of air-conditioning as a way to cool things down, many drivers aren't aware that their air-conditioner is also capable of producing hot, dry air. It most certainly can, and this warm, dry air is just about the nicest way to face a cold, wet drive to work, as it'll also start drying out the rain your clothes absorbed on the run to the car.